On drugs.
It is a controversial subject in modern times, but it was not controversial to ancient spiritual traditions. Many spiritual traditions consider them valid, they have been used by the ancient Vedic people(Soma plant) by shamans in all traditions, and even yogis and tantics have used them. Patanjali very explicitly mentions them as being another valid way to reach supersensible realities and attain psychic powers:
4.1 Psychic powers arise by birth, drugs, mantras, purificatory acts and austerity(tapas or sadana)
In other words you can be born with knowledge and powers of supersensory things. If not, you can also attain them through drugs, mantras, some kind of kriya yoga(cleanses the pranic system and activates the kundalini) or through pure sadana.
I by no means condone taking drugs because of the pitfalls associated with them, but they do have the power to take you there. I have only done one drug once in my entire life and that was mushrooms in a small dose, and it gave me a lot of experiences instantly that I’ve had to work really hard for in Yoga. It helped me make sense of all things I was doing prior to that(qiqong) I could actually feel the the prana when doing the qigong exercises. The meditation also made sense as my consciousness became like a laser, whatever I focussed on it penetrated very deep in it. The chanting of the mantra OM proved to be very powerful. It also made me realise just how special everybody is, because everybody I looked at looked like their own universe to me. I just became an observer with no judgement watching the person and how fascinating they were. None of this was hallucination because I had full control over the entire process. I could zoom in and zoom out so to speak.
It was a turning point in my spiritual journey and since I have not done it ever again. I had approached it with the right sacred intention that that the ancient traditions used it for not as some kind of recreation. This is why I never felt the need to do it again. It simply confirmed to me that Yoga worked and I can get to these states the natural way using Yoga.
Drugs are not entirely random. Of course individual experiences will vary but we can make general predictions about what will happen at different doses. This is why the mental plane has both subjective(subconscious) and objective properties(constructed similarly) So yes in a near death experience each person will have a different experience based on their subconscious(some will see Jesus, some will see Buddha etc) but the generals will be remarkably consistent(life review, hall of records/information) Some people who share similar subconscious patterns will share the same reality(intersubjective realities)
Please review the research of Robert Monroe who is a pioneer in the research of the mental plane. He has found there are places just like the Christian heavens and hells, places just like the Muslim heavens and hells, and places just like the Hindu heavens and hells. He is also found at more higher planes there are more stable planes of reality which are unlike any imagination on earth and they have their own exotic life. This is something Machio Kaku predicts as well at higher dimensions there could be exotic life made out of higher vibrational matter.